Sony Cybershot,Cyber-shot DSC-S750 Instruction Manual page 12

[ To remove the battery pack/"Memory Stick Duo"
Open the battery/"Memory Stick Duo" cover.
"Memory Stick Duo"
Make sure that the access lamp is not
lit, then push the "Memory Stick Duo" in
once.
• Never remove the battery pack/"Memory Stick Duo" when the access lamp is lit. This may cause damage
to data in the "Memory Stick Duo"/internal memory.
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Battery pack
Slide the battery eject lever.
Be sure not to drop the battery pack.